A solid uniform spherical boulder rolls down the hill as shown in the figure(Figure 1) , starting from rest when it is H = 43.0{\rm m} above the bottom. The upper half of the hill is free of ice, so the boulder rolls without slipping. But the lower half is covered with perfectly smooth ice. Part A How fast is the boulder moving when it reaches the bottom of the hill? v = __________________m/s}

What is the ratio of the radii of their orbits : A 3.00*10^2-eV electron and a 1.00*10^2-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits? |

What angle will the second order peak occur : A diffraction grating with 280 lines per mm is used in an experiment to study the visible spectrum of a gas discharge tube. At what angle from the beam axis will the first order peak occur if the tube emits light with wavelength of 400.0 nm? At what .. |

Two straight wires run parallel to each other : Two straight wires run parallel to each other, each carrying a current in the direction shown below. The two wires experience a force in which direction? B) What happens when one of the currents is turned off? |

According to the definition of work : According to the definition of work, the work done by an external force in moving a heavy crate along a horizontal surface should be the same whether the force is pulling upward at a 45 degree angle or pushing downward at a 45 degree angle. In practi.. |

Solid uniform spherical boulder rolls down the hill : A solid uniform spherical boulder rolls down the hill as shown in the figure(Figure 1) , starting from rest when it is H = 43.0{\rm m} above the bottom. The upper half of the hill is free of ice, so the boulder rolls without slipping. But the lower h.. |

Two blocks are connected by a light cord : Two blocks are connected by a light cord. One block, of mass 4kg, sits on a horizontal table with static and kinetic coefficients of friction of 0.6 and 0.4, respectively, whereas the other block, of 2 kg mass, hangs over a frictionless light pull.. |

Calculate magnitude-direction of magnetic field in region : In Figure 20.12, a small particle of charge q = -7.0 x 10^-6 C and mass (m = 3.1x10^-12) has velocity (Vo = 9.4x10^3 m/s) as it enters a region of uniform magnetic field. The particle is observed to travel in the semicircular path shown, with radius .. |

Beam of electron is accelerated through potential difference : A beam of electrons is accelerated through a potential difference of 10 kV before entering a region having uniform electric and magnetic fields that are perpendicular to each other and perpendicular to the direction in which the electron is moving. I.. |

Two blocks are attached by a light string : Two blocks are attached by a light string with one resting on a rough table and the other hanging over the edge via a frictionless pulley. If the blocks are initially at rest, the tension force is equal to the hanging weight. |

## Determine what is the density of the objectA rectangular object with mass m floats in water so that a fraction ? = 0.25 is submerged. What is the density of the object |

## Determine the speed of the car before impactAn automobile having a mass of 1,000 kg is driven into a brick wall in a safety test. The bumper behaves like a spring with constant 5.85 106 N/m, What was the speed of the car before impact |

## Obtain how long does it take the swimmer to cross the riverA swimmer, capable of swimming at a speed of 1.44 m/s in still water (i.e., the swimmer can swim with a speed of 1.44 m/s relative to the water), How long does it take the swimmer to cross the river |

## What is the minimum angle between the ladder and the floorA 6 m long 50 kg ladder leaning on a frictionless wall can successfully be scaled by a 120 kg man. What is the minimum angle between the ladder and the floor |

## A hanging wire made of an alloy of aluminum with diameterA hanging wire made of an alloy of aluminum with diameter 0.12 cm is initially 2.8 m long. When a 40 kg mass is hung from it, the wire stretches an amount 1.57 cm. A mole of aluminum has a mass of 27 grams, and its density is 2.7 g/cm3. |

## What is the tension in each ropeA 100-kg streetlight is supported equally by two ropes. One rope pulls up and to the right, 40° above the horizontal; What is the tension in each rope |

## Find the magnetic field at the location of the upper wireThree long, parallel, straight wires pass through the vertices of an equilateral triangle that has sides L = 11.6 cm, as shown in the figure below. A a dot indicates that the direction of the current is out of the screen and a cross indicates that.. |

## A wall was constructed in middle of near field region1. given the energy range of a radiation source to be 0.5 ev. calculate the same energy range in joules. dont use the |

## Describes the energy transformations for the pianoA piano is brought upstairs by two workers. Due to a mistake by one of the workers, the piano rolls down the stairs and finally comes to rest by the outside door. |

## What is the angular impulse on the basketballTwo children are playing a game. The rst throws a basketball straight up, and the second tries to hit it with a thrown baseball. What is the angular impulse on the basketball |

## How many molecules are in the sampleIn a 6.5×10?3-m3 volume of ideal gas at the pressure of 2.7×106 Pa, How many molecules are in the sample |

## Evaluate the average intensity of the first waveElectromagnetic wave 1 has a maximum electric field of 56V/m , and electromagnetic wave 2 has a maximum magnetic field of 2.0muT, Calculate the average intensity of the first wave |

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